Testing apparatus for air and other gases.



M. ARNDT. TESTING APPARATUS FOR AIR AND OTHER GASES.

APPLIOATION FILED OUT. 15, 1912.

Patented June 24, 1913.

ZZZ/622x50" UITE MAX ARNDT, or AIX-LA-CHAPELLE, GERMANY.

TESTING APPARATUS FOR AIR AND OTHER GASES.

Specification of Letters Patent.

Patented June 24, 1913.

Original application filed September 11, 1911, Serial No. 648,634.Divided and this application filed October To all whom it may concern:

Be it known that I, Max ARNDT, a subject of the German Emperor, residingat .Aix-la-Chapelle, Germany, have invented certain new and usefulImprovements in Testing Apparatus for Air and other Gases; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to letters or figures of reference markedthereon, which form a part of this specification.

My invention relates to apparatus for testing gas mixtures for thecomparative contentof one of the constituents, for example, fordetermining the content of carbonic acid gas in air, by causing the airto act on a reagent whose color changes more or less rapidly inaccordance with the quantity of carbonic acid present in the air.

The present application is a division of my application Serial No.648634, filed September 11, 1911.

The apparatus comprises a barometric vessel or Mariottes flask forcontaining both the reagent and a filamentous or cord-like wick that isto absorb the reagent and act as the means for exposing small quantitiesof the reagent to the gas or air to be tested, so that the wick or cordwill absorb the reagent directly from the flask. apparatus in order toprevent reagent liquid from leaving the flask when the apparatus istaken from a cool to a warmer place thereby expanding both liquid andairabove the liquid level the air inlet tube is provided with anenlargement into which the liquid displaced by reason of such expansionwill be forced.

In order that the wick may have a suit able support and yet not be freeto swing to and fro, the flask is made conical, the smaller end beinguppermost when in opera-ting position.

In the accompanying drawing the Mariottes flask or barometric vessel ais conical, having a neck a and a central tube a extending from thesmaller end of the flask, where it is enlarged, as at a for thereception of a stopper o toward the neck a and ending in a chamber (1The stopper 2) is inserted during the operation to prevent the air orother gas from entering the tube a In such an Serial No. 725,905.

and reacting on the wick and reagent in said tube. As soon as thereagent has been removed from a and a by capillarity of the wick, airbubbles Z will ascend in a to equalize the pressure.

The flask is closed at its lower end by a stopper 9 in the neck a and issupported neck down in the tubular central portion 10 of an annularvessel cc. A ball f of wick f rests on the stopper g and the wick isdrawn up through a a, and hangs over the side of the flask a the lowerend depending from the larger diameter of the flask over the annularvessel to which catches the drippings from the Wick f. Air to compensatefor the reagent discharged by the wick f enters through a, a and a andis discharged as bubbles Z from the bottom of a The chamber a serves toreceive the reagent forced therein by increased pressure of the airabove the level of the reagent, due to rapid temperature changes of theoutside air, and prevent-s the level of the reagent from rising too highin a I claim 1. A testing apparatus comprising a conical barometricflask, a closure for the flask, a tube extending from the apex of theflask toward the closure and having an enlarged chamber at its end, anda wick extending through the tube.

2. A testing apparatus comprising a conical barometric flask having aneck at its larger lower end, a closure for the neck,

a tube extending from the top to near the bottom of the flask havingenlargements at both ends, a closure for the upper enlargement and awick in said flask extending through the tube.

3. A testing apparatus comprising a conical barometric flask, a closurefor the flask, a tube extending from the apex of the flask toward theclosure and having an enlarged chamber at its end, a wick extendingthrough the tube, and a holder for the flask comprising a vessel toreceive the discharge from the wick.

4. A testing apparatus comprising a conical barometric flask having aneck at its larger lower end, a closure for the neck, a tube extendingfrom the top to near the bottom of the flask having enlargements at bothends, a closure for the upper enlargement, a wick in said flaskextending through the tube and an annular vessel having a as myinvention, I have signed my name in central tubular support for theflask, stud presence of tWosubserlblng wltnesses. Yessel of largerdlzuneter than the flask to r T r permit the WlCk to lie on the sides ofthe MAX 5 flask and depend from the bottom thereof Witnesses:

into the Vessel. T. BEOKERS,

In testimony that, I claim the foregoing HENRY AUsDrL'ue.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

